Invalid PID

[mk6gtracer]

I'm trying to tune my LS1. I'm using a 1220411 PCM with a custom (MAFless) operating system. I get an invalid PID message when I try to look at HO2S21. Any ideas as to what I'm doing wrong?
Thanks

[mr.prick]

Have you validated all PIDs?
Sometimes some PIDs will be Xed out after launching the software
but will be valid once logging begins.
Select it anyways and start logging.

[mk6gtracer]

Thanks for the reply. I have selected it anyway. When I log the data, it flatlines.

[joecar]

Connect to vehicle and validate pids.

[mr.prick]

Thanks for the reply. I have selected it anyway. When I log the data, it flatlines.

The PID becomes valid?

Any O2 DTCs?

[mk6gtracer]

The PID does become valid, I guess, when I log data, at least it isn't x'd out. Problem is, the data never changes.

[mk6gtracer]

The PID for the left bank logs data and oscillates as you would expect

[mr.prick]

The sensor may be dead.

[joecar]

Post some logs.

[mk6gtracer]

I connected the sensor for the right bak, which has and still is working. The value stayed at .250, never fluctuated. I checked continuity back to the PCM, no problems there either